What Is Gastroscopy?

Gastroscopy, formally known as upper gastrointestinal endoscopy, uses a thin flexible tube (approximately 1 cm in diameter) with a camera to examine the esophagus, stomach, and duodenum. Images are displayed on a monitor, allowing physicians to detect abnormalities such as:

• Esophageal varices
• Gastric ulcers
• Inflammation
• Polyps
• Tumors
• Sources of bleeding

During the procedure, treatments may also be performed, including biopsy, polyp removal, bleeding control, or variceal ligation.

Preparation Before Examination

1. You must complete the Examination and Treatment Consent Form and fast (no food or drink) for at least 6–8 hours prior to the procedure.
2. Outpatients: Please bring your National Health Insurance card and appointment slip to the Gastroscopy Room (2nd Floor, First Medical Building) for check-in.
   Inpatients: You will be escorted by Duty Center staff.

Fasting is essential to ensure clear visualization and to reduce the risk of aspiration during sedation.

Examination Procedure

1. A local anesthetic spray and anti-gas medication will be administered to reduce discomfort.
2. Please lie on your left side.
3. The physician will gently insert the endoscope through your mouth into the esophagus, stomach, and duodenum.
   During insertion, avoid swallowing and allow saliva to flow naturally from your mouth.
4. If necessary, tissue samples may be collected for pathological examination.
5. The entire procedure takes approximately 20–30 minutes.

Post-Examination Instructions

1. Rinse your mouth to remove residual throat anesthetic.
2. Do not eat for 1 hour after the examination.
   If a biopsy was performed, follow your doctor’s instructions and fast for 1–2 hours.
   Start with a small sip of water. If there is no choking or difficulty swallowing, you may resume your normal diet.
3. Inform healthcare staff immediately if you experience fever, abdominal pain, vomiting blood, or bloody stools.
   After discharge, seek medical care promptly if any of these symptoms occur.

Rare Complications

1. Bleeding (rarely requiring blood transfusion)
2. Infection (usually mild and treatable with antibiotics; preventive antibiotics may be given for high-risk patients)

Prevention of Possible Complications

• Avoid smoking and alcohol
• Avoid hot or spicy foods
• Avoid strenuous activity or heavy lifting
• Avoid foods that may cause diarrhea (such as raw seafood)

Seek Immediate Medical Attention If You Experience:

1. Fever
2. Chest pain
3. Shortness of breath
4. Black or bloody stools
5. Difficulty swallowing
6. Severe or persistent abdominal pain
7. Vomiting, especially blood or coffee-ground-like material